(computing, less common) Synonym of bit rot

A hypothetical process whereby spacetime undergoes a phase transition (decays) into a lower-energy state.

(historic preservation) State of preservation where no attempt is made to improve a ruin, but rather to keep it from deteriorating any further.

plural of alpha decay

(physics) Radioactive decay by emitting an alpha particle.

(creationism, pseudoscience) The discredited theory that the speed of light has decreased over time, proposed by creationists in order to support the belief that the universe is a few thousand years old even though there are objects visible today that are billions of light years away (whereas a constant speed of light would indicate that the universe is billions of years old and so contradict this belief).

(physics) A nuclear reaction in which a beta particle (electron or positron) is emitted.

(physics) Any of several processes by which unstable nuclei emit subatomic particles and/or ionizing radiation and disintegrate into one or more smaller nuclei.

(physics) A chained series of the products of nuclear decay of a particular isotope

(programming) The conversion of an array variable into a pointer to its first element.